ci(deps): bump docker/metadata-action from 5 to 6 (#45)

Author: dependabot[bot]

.github/workflows/docker-build-push-multi-registry.yml

@@ -94,7 +94,7 @@ jobs:
 
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: |
             ${{ inputs.dockerhub-repo }}
@@ -186,7 +186,7 @@ jobs:
 
       - name: Docker meta
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         with:
           images: |
             ${{ inputs.dockerhub-repo }}